The pickup's driver, 64-year-old John Pew of Nampa, was killed. Callahan and two young passengers in his car were hospitalized.

The misdemeanor charge was filed against Callahan in March, one year after the deadly wreck. According to the criminal complaint, read by a judge at Thursday's hearing, Callahan "commit[ed] the unlawful act of failure to maintain your lane and/or did drive down a median and/or was careless or inattentive in light of the circumstances in existence, without gross negligence."

The crime is punishable by up to a year in jail, a $2,000 fine, or both. In addition, Callahan's driver's license will be suspended for a length of time to be determined at sentencing.